Posthole digger



March 29, 1927. 1,622,704

0. COIL I POSTHOLE DI GGER Filed March '7, 1925 4Seets-S set 1 l/V V' NTOP. 0 770 C 0/1.

A TTOR/VEY 0. COIL POSTHOLE DIGGER March 29 1927.

INVENTOR.

4 Sheets-bheet 2 Filed March 7 v1925 ATTORNEY March 29 1927.

O. COIL POSTHOLE DIGGER WW Iii mm 3. x 3 m Q p M Q N .0 NM a E w Mm M mmm a F a 3 8 x mm Q N 0 6% H fifi N INVENTO/i', OTTO COIL m. mm

A TTO/PNEX 0. COIL March 29 1927.

POSTHOLE DIGGER 4 Sheets-Sheet 4 Filed March '7 1925 ATTORNEY iii)Patented Mar. 29, 1927.

UNITED STATES OTTO CQIL, OF FAYETTE COUNTY, OHIO.

YOSTHOLE DIGGER.

Application filed March 7, 1925. Serial No. 13,679.

This invention relates to post hole diggers and one object of theinvention is to provide a device for digging post holes and the likewhich can be mounted upon a tractor, or other motor driven vehicle, andoperated by the motor of that vehicle.

A. further object of the i nye.ntion is to provide such a device whichcan be quickly and easily mounted on or removed from the motor vehicleand which will be of such a character that it can be readilyaccommodated to tractors or vehicles of different kinds and sizes.

A further object of the invention is to provide such a mechanism whichwill be simple in its construction and operation and which can bereadily controlled by the op erator from the drivers seat on thevehicle.

A further object of the invention is to provide such a device which willbe of a very strong durable character and Which can be produced at arelatively low cost @ther objects of the invention will appear as themechanism is described in detail.

In the accompanying drawings Fig. 1 is a side elevation of a mechanismembodying my invention. showing the same mounted on the front end of atractor; Fig. 2 is a plan view of the boom, partly broken away and withthe supporting frame in section; Fig. 3 is a front elevation of thedriving and controlling mechanism, partly broken away; F l is a verticalsectional view taken on the line l-4c of Fig. 3, looking in thedirection of the arrows; Fig. 5 is a detail view of the mounting for theclutch actuating device; Fig. 6 is a front elevation of the auger andits supporting device partly broken away; Fig. 7 a bottom end view ofthe auger; Fig. 8 is a sectional detail. view of the connection betweenthe auger shaft and the auger point; Fig. 9 is a side elevation of alower portion of the auger; Fig. 10 is a plan view, partly in sec tion,of the clamping device for securing the frame to the motor vehicle; Fig.11 is a front elevation of the same; and Fig. '12 is a section taken onthe line 1212 of Fig. 11.

In these drawings I have illustrated one embodiment of my invention andhave shown the same as mounted on the front end of a tractor but it willbe understood that this particular embodiment has been chosen for thepurpose of illustration only and that the mechanism may take variousforms and may be mounted on motor vehicles of various kinds.

In that embodiment of the invention here illustrated the mechanismcomprises a main upright frame 1 consisting of substantially parallelside members rigidly connected one to the other by suitable cross bars,two of which are shown at 2. This frame may be mounted on the tractor inany suitable manner but the connection is preferably a detachable oneand of such a character that the mechanism may be quickly and easilymounted on or removed from the tractor, thus enabling the tractor to beequipped with the post hole digging mechanism when desired, and theconnections are preferably also of such a character that the mechanismmay be mounted on the tractor without change in the constructionthereof. In the present instance, I have secured to the lower end of theframe a transverse bar 3 adapted to engage the lower portion or base ofthe radiator frame and having hook shaped members 4 to engage over theedge of that frame or base and hold the main frame 1 against downwardmovement. Cooperating with the bar 3 is a clamping member 5 arranged onthe opposite or rear side of the base of the radiator and connected withthe bar 3 by bolts 6, whereby the clamping members and the bar may bedrawn into firm clamping engagement with the base of the radiator, orother supporting part. The front bar or main clamping member may, ifdesired, be made adjustable so as to accommodate it to radiators ofdifferent widths and to this end I have shown the same as formed of twooverlapping parts provided with registering slots 7 through which extendbolts 8 by means of which the two parts may be rigidly connected in anyadjusted position. The clamping member or bar 5 may also be in one ormore pieces. As here shown, this member comprises two separate shortbars which extend inwardly so as to overlap the base or frame of theradiator a distance sufficient to provide the desired clampingconnection. Where the inner portion of the base is in the form of anangle iron these inwardly extending bars may have hook shaped ends 9 toengage over the edge of that bar and thus more firmly connect the samethereto. The lower portions of the side members of the main frame arepreferably formed separate from the upper portions of those membe e, asshown at 10, so that the lower portion of the frame will beinterchangealde with relation to the upper portion and by using lowerportions of different sizes or by adjusting the lower portion todifferent widths a single main frame 1 may be mounted on any one of anumber of vehicles of different sizes and kinds. it being only necessaryto so position or shape the lower members as to establish the properconnection between the clamping device and the upper part of the mainframe. The main frame is supported in an upright position by means ofbrace rods 11 extending downwardly and rearwardly from the upper endthereof and connected with any suitable fixed part of the vehicle.

A boom 12 is pivotally mounted on the main frame 1 and extends forwardlythere from and. as here shown, comprises two side members spaced apartand connected one to the other by tie bars 13. F apper-ted from theouter end of this boom is an auger 1.4; which comprises a shaft 15having); at its lower end a point- 16 and bits 17 and also having aspiral rib 18 leading from the bits to the upper portion of the auger.The auger may be mounted on the boom in various ways but. in the presentdevice, the shaft 15 thereof is journaled in bearings 19 and 20 formedin a yoke 21, the arms of which are provided with bearings 22 by meansof which the yoke is pivotally mounted on a shaft 23 which in turn isiournaled in bearings 24: in the outer ends of the boom arms. The shaft1:) of the auger has riggidly secured thereto a beveled near 25 whichmeshes with a corresponding bevel gear 26 mounted on the shaft 23 andhas rigidly secured thereto a sprocket wheel 27. The sprocket wheel 27is connected by a sprocket chain 28 with a second sprocket wheel 29mounted on a main driving; shaft S0. in the present construction, ithave ric' secured to the side members of the main me 1 forwardlyextending bearing brackets 31. The outer portion of each bracket isbifur cated to form pivot lugs between which is mounted a bearing member33 rigidly secured to and forming a part of the adjacent arm of the boomand this bearinp; member is pivotally mounted on the pivot lugs means ofa pivot pin 34. Each bear-i. bracket is also provided between its innerand outer ends with a bearing 35 in which the driving shaft 30 ismounted. This drivinc; shaft is preferably driven from the motor of thevehicle on which the mechanism is mounted and it may be connected withthat motor in any suitable manner. In the present mechanism, a pulley 3Gis azar/o4.-

rigidly secured to one end of the shaft and is connected by means of abelt 37 with a Second pulley 38 which is operatively connected at themotor and which. in the present instance, forms a part of the tractor onwhich the mechanism is mounted.

The sprocket wneel 29. which driics the anger, is loosely mounted on theshaft 3t) and has rigidly secured thereto a clutch member 89 with whichcooperates a second clutch member 4-0 slidably mounted on the shaft butheld against rotation relatirel thereto. The clutch member 4-0 i ereshown provided with a circumfcren"al groove 11 into which extend the twoarms of a. clutch shiftingyoke 42, whi-h yoke is rigidly secured to avertical rod or a shaft rotatably mounted in the transverse members ofthe main frame. This rod emeads upwar lly from the transverseillQlilllQl'r. 2 cf the frame and he at its upper end. a trans verselyextending; portion 44; which is connected. with a rod or cable 45 whichextends rearwardly to a point adjacent to the operators seat. In thepresent arraiui'enient. there is no actuating device connectml with thered l5 but obviously a suitable actuatinn device. such as a lever. maybe provided therefor in a well known manner. A sprim: 16 acts on theclutch shifting: yoke 4-2 to hold the clutch normally in its dis-e1 '1"l position. so that the shaft 30 may rotate in the sprocket wheel 29without operating the a pier. When the auger is to be opcr. ;ed the yoke42 is moved against the i'OliSiOl' 1" the spring 16. by means of the rodor cable 45, to engage the clutch member ll) with the clutch. member 39of the spro. t wheel.

The boom 12 and the auger carried there y are supported in elevatedpositions and thei movei'nent about the axis of the boom C01.- trolledby means of a cable 4-? which passes about a sheave 448 near the outerend of the boom and about a second sheave elf) near the top of the mainframe 1. The cable extends downwardly from the sheave if) and secured toand wound about a suitable drum which, in the present device, consmerely of a shaft journaled in suitable bearings 51 on the respectiveside members of the main frame 1. Bigidly secured to one end of theshaft 50 a brake drum 52 with which cooperates a brake shoe rigidlysecured to an actuatine arm 54: which is pivotally mounted on a bearingbracket 55 ri idly secured to the main frame. The

arm 5% has connected therewitl'i. a Snll'flbli, actuating member, suchas a rod or cable 56, which ex ends to a point ad' cent to the operatorsseat to enable the b to be contro led by the operator. Obviously whenthe frict' m of the hr shoe 53 on the brake drum 52 is relieved the boomf unrw stra an mu will more downwardly. i'

ned, by their own weight and the cable will be unwound from the drum 50.During the digging operation the brake shoe is retained in aninoperative position so that the auger and boom may move dmvnwardiy asthe digging progresses.

In order to lift the boom and auger at the end of the. digging operationI have provided means whereby the drum may be actuated from the maindriving shaft 80. In the present arrangement of the mechanism this isaccomplished by providing a hoistii'ig shaft which consists of twoparts: 58 and 59, the part 58 being journaled in a fixed bearing 60 onthe main frame and the part 59 of the shaft being connected with thepart 58 thereof by means of a universal joint 61 and having its outerportion journale d in a floating bearing 62 which, as, here shown, isformed in a lever 63 pivotally mounted at bet on the main frame. Theouter end of the shaft 59 ex tends into the brake drum 52 and hasrigidly secured thereto a friction wheel. 65 which is movable into andout of contact with the inner periphery of the brake drum 52, thismovement of the friction wheel being controlled by the movement impartedto the floating portion 59 of the shaft by means of lever 63. A spring66 acts on the arm to hold the friction wheel normally in an inoperativeposition. The upper end of lever 63 lies in the path of an arm 67rigidly connected with the actuating arm 5st for the brake shoe 53, sothat the movement of the arm 67 by the actuating arm will move the lever63 forwardly about its axis 64; and thus carry the friction wheel intofrictional contact with the drum. The fixed part 58 of the hoistingshaft has secured thereto a sprocket wheel 68 which is connected by asprocket chain 69 with a sprocket wheel 70 of the driving shaft 30.Consequently when the driving shaft 30 is in operation and the frictionwheel 65 is moved into engagement with the brake drum this drum will berotated in a direction to wind the cable 17 onto the drum or shaft 50and thus hoist the boom and anger so as to move the latter out of thehole which has been dug and to lift the same the desired dis tance abovethe ground. It will be noted that the brake 53 and a friction wheel 65are controlled by the same actuating mechanism. lVhen the mechanism isidle the brake shoe will be in operative engagement with the brake drumand the boom and anger will be retained in their elevated po sitions. Atthe beginning of the digging operation the actuating arm 54 is operatedsufficiently to relieve the brake and permit the auger to movedmvnwardly and is retained in this position during the diggingoperation. At the end of the digging operation a fin-their movemei'it isimparted to the actuating arm and this further movement will carry thefriction wheel 65 into contact with the brake drum and cause the augerto be hoisted. At the end of the hoisting operation the actuating leveris relieved and a spring (36 on lever 68 will move the friction wheelinto an inoperative position and will act on the brake, through the arm67, to press the same into operative engagement with the brake drum.

Suitable means are provided for controlling the position of the angerwith relation to the boom and, as here shown, this means comprises a rod71 pivot-ally connected at its forward end to the lower portion of theyoke 21 and having its rear portion slidably mounted in one of thetransverse tie bars 13 of the boom 12. A spring 72, confined between thetie bar and a fixed stop or collar 73 on the rod, holds the rod normallyin its outermost position but permits the end of the yoke to moverearwardly with relation to the boom. By adjusting the stop or collar 73on the rod the initial position of the auger may be varied. In theoperation of the device I prefer that at the beginning of the diggingoperation the auger should occupy a slightly inclined position, as shownin Fig. 1, and as the boom moves downwardly about its axis and the upperend of the anger is moved outwardly during the digging operation, theauger will assume a substantially true vertical position at the end ofthe digging operation. This results in a slight enlargement orelongation of the upper portion of the hole but this is notobjectionable and it is preferable to the use of a more or lesscomplicated mechanism which would be necessary to maintain the anger atall times in a true vertical position.

The auger itself may be of any suitable character preferably, as abovestated, it is of the spiral type and, as here shown, it comprises atubular body portion 7 4 to which the spiral rib 18 is secured andthrough which the shaft 15 extends. The shaft 15 terminates a shortdistance above the lower end of the tubular body portion 74 and thepoint 16 of the anger is provided with a shank 76 which extends into thelower end of the tubular body portion 74'.- The shaft 15 is preferablyconnected directly with the point 16 and the cutting edges or bits 17 ofthe auger so that the major digging strains are imposed upon the shaft15 and not upon the tubular body portion of the auger. In the presentconstruction, T have mounted about the lower end of the tubular bodyportion 74 a sleeve or coupling member 77 to which the lower portion ofthe spiral 18 and the bits 17 are rigidly secured. A bolt 78 extendsthrough the sleeve, the body portion and the lower end of the shaft 15to rigidly connect these members one to the other, and a second bolt- 79 extends through the sleeve, tubular body portion and the shank of theauger point to rigidly connect these members one to the other, therebyrigidly connecting the shaft with the bits and the point of the auger.

In the oneration of the mechanism the tractor is advanced along the lineof the fenrc to position the point of the auger at the point where thehole is to be dug and the brake 52% released to permit the auger to moredownwardly so that the point thereof will cnasagre the ground. Theclutch is then shitted to connect the driving shaft with the auger andthe digging operation commenced. its the auger moves downwardly it willgradually move toward a true vertical position so that at the end of hedi inn' operation the auger will be in subslan ally a vertical position.l i hen the hole has been dug to the desired depth the actuating); arm54: of the brake shoe is moved a further distance "0 the rear so as tothe friction wheel to operatively move the brake drum, at d at the sametime to maintain the brake shoe 53 out of (infringement with the brakedrum. In this manner an operative connection is establ shed between thedriving shaft and the hoi ti drum or shaft which causes the cable l? tobe wound onto the drum and the outer end of the boom elevated and theauger to be lifted out of the hole. lVhen the elevation has beencompleted the actuating arm is released. thus permitting the connectionbetween the hoisting); drum and the driving shaft to be interrupted. andthe brake shoe to again engage the drum and to retain the auger in itselevated position. The tractor s then advanced to the next location andhis operation is repeated.

ll'hile l have shown and described one embodimentof my invention 1 wishit to be understood that I do not desire to be limited to tine detailsthereof as various modifications may occur to a person skilled in theart.

Having now fully described my invention, what I claim as new and desireto secure by Letters Patent, is:

1. In a mechanism of the character described, an upright frame, a boompivot-ally mounted at one end on said frame, an anger carried by theother end of said boom, opcrating mechanism mounted on said frame andsaid boom to raise and lower said boom and to rotate said auger, meansfor rigidly humming aid frame on the forward end of a motorvehicle withthe boom extending; fmrwardly from said vehicle, am

detachable means for operativeiy connecting said operating mechanismwith the motor of said vehicle.

2. In a mechanism of the character described, an upright frame, a boompivotally mounted at one end on said frame, an anger carried by theother end of said boom, operating mechanism mounted on said frame andsaid boom to raise and lower said boom and to rotate said auger, meansfor rigidly mounting said frame on the forward end of a motor vehiclewith the boom extending forwardly from said vehicle, detachable meansfor operatively connecting said operating mechanism with the motor ofsaid vehicle, aml means extending roarwardly from Said frame forcontrolling said operating; mechanism.

In a mechanism of the character described, a frame, a longitudinallyadjustable clamping member secured to the lower portion of said frame,cooperating; clamping devices connected with said clamping memher, tosecure said frame to a part of a motor vehicle, means carried by thefirst mentioned clampii member to engage said part of said vehicle andhold said frame against do\'\'n'-.vard movement, a boom mounted on saidframe, an anger carried by said boom, and means for operativelyconnecting said auger with the motor of said vehicle.

l. In a mechanism of the character described, an upright frame, a boompivotally mounted on a llIiGCl. axis on said frame. an anger carried bysaid boom, means supported by said boom for rotating said auger.hoisting: mechanism for said boom mounted on said frame, means forrigidly mounting said frame on a motor vehicle, and detach able meansfor operatively connectine' said rotating means and said hoistingmechanism with the motor of said vehicle.

5. In mechanism of the character de- Fa-ribed, an upright frame, a boompivotally m tinted on a fixed axis on said frame, an anger carried bysaid boom, means supported by said boom for rotating said auger, adriving member mounted on said frame and operatively connected with saidrotating, means, hoisting mechanism for said boom mounted on said frame,means for operatively connecting said hoisting mechanism with saiddriving member, means for rigidly mounting said fran'ie on a motorvehicle, and detachable means for operatively connecting said drivingmen1bewith the motor of said vehicle.

6. In a mechanism of the character described, a frame, a boom pivotallymounted on said frame, an auger carried by said boom, means supported bysaid boom for rotating said auger, a driving member mounted on saidframe and opcratively connected with said rotating means, a. hoistingdrum mounted on said frame, a cable connecting said drum with said boom,a brake to hold said boom normally against rotation, means to establish.an operative connection. between said drum and said driving member,means for detachably mounting said frame on a motor vehicle, anddetachable means for cperatively connecting said driving member with themotor of said vehicle.

7. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a boom pivotally mounted on saidframe, an auger pivotally supported from the'outer end of said boom,means supported at the outer end of said boom for rotating saidauger, adriving member mounted on said frame and operatively connected with saidrotating means, a hoisting drum, a cable connecting said hoisting drumwith said boom, a brake to hold said hoisting drum normally againstrotation, means for establishing an operative connection between saidhoisting drum and said driving member, and a single actuating device forcontrolling said brake and the connection between said drum and saiddriving member.

8. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a boom pivotally mounted on saidframe, an anger supported driving member mounted on said frame, anoperative connection between said driving member and said auger, ahoisting drum mounted on said frame, a cable connecting said hoistingdrum with said boom, a brake drum secured to said hoisting drum, a brakemember acting on said brake drum to control the position of said boom,an actuating mei'nbcr movable into and out of engagement with said brakedrum, an operative connection between said actuating member and saiddriving member, and means for controlling the engagement of said. brakemember and said actuating member with said brake drum.

9. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a boom pivotally mounted on saidframe, an auger supported from the outer end of said boom, a drivingmember mounted on said frame, an operative connection between saiddriving member and said auger, a hoisting drum mounted on said frame, acable connecting saidhoisting drum with said boom, a brake drum securedto said'hoisting drum, a brake member acting on said brake drum tocontrol the position of said boom, a shaft rotatably mounted on saidframe and operatively connected with said driving member, a frictionwheel connected with said shaft for rotation therewith and for movementrelatively thereto transversely to its axis of ro tation, said frictionmember being so arranged that it will be moved into and out of operativeengagement with said brake drum by said transverse movement, and meansfor moving said brake member out of engagement with said brake drum andfor from the outer end of said boom, a

moving said friction wheel into operative engagement with said brakedrum.

10. In a mechanism of the characterdescribed, a frame having means formounting the same on a motor vehicle, a boom pivotally mounted on saidframe, an anger supported from the outer end of said boom, a drivingmembermounted on said frame, an operative connection between saiddriving member and said auger, a hoisting drum mounted on said frame, acable connecting said hoisting drum with said boom, a brake drum securedto said hoisting drum, a brake member acting on said brake drum tocontrol the position of said boom, a shaft rotatably mounted on saidframe and operatively connected with said driving member, a frictionwheel connected with said shaft for rotation therewith and for movementrelatively thereto transversely to the axis of rotation, said frictionmember being so arranged that it will be moved into and out of operativeengagement with said brake drum by said transverse movement, and anactuating device for first moving said brake member out of engagementwithsaid brake drum and for then moving said friction wheel intooperative engagement with said brake drum.

11. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a boom pivotally mounted on saidframe, an auger supported from the outer end-of said boom, a drivingmei'nber mounted on said frame, an operative connection between saiddriving member and said. auger, a hoisting drum mounted on said frame, acable connecting said hoisting drum with said boom, a brake drum securedto said hoisting drum, a brake member acting on said brake-drum tocontrol the position of said boom, a shaft comprising two parts, onepart of which is mounted in a fixed bearing on said frame and the otherof which is mountedin a bearing movably mounted on said frame, auniversal connection between the two parts of said shaft, an operativeconnection between the first mentioned part of said shaft, and saiddriving member, a friction wheel carried by the last mentioned part ofsaid shaft and arranged for movement into and out of contact with saidfriction drum, a lever' connected with said movable bearing, a springacting on said lever to hold said friction wheel normally in aninoperative postion, and means for moving said brake member into aninoperative position with relation to said brake drum and for actuatingsaid lever to move said friction wheel into contact with said brakemember.

12, In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a boom pivotally mounted on saidframe, an anger supported from the outer end of said boom, a

driving member mounted on said frame, an operative connection betweensaid driving member and said auger. a hoisting drum mounted on saidframe, a cable connecting said hoisting drum with said boom, a brakedrum secured to said hoisting drum, a brake member acting on said brakedrum to control the position of said boom, a shaft comprising two parts,one part of which is mounted in a fixed bearing on said frame and theother of which is mounted in a bearing movably mounted on said frame, auniversal connection between the two parts of said shaft, an operativeconnection between the first mentioned part of said shaft and saiddriving member, a friction wheel carried by the last mentioned part ofsaid shaft and arranged for movement into and out of contact with saidfriction drum, a lever connected with said movable bearing, a springacting on said lever to hold said friction wheel normally in aninoperative position, an actuating arm pivotally mounted on said frameand connected with said brake member, and a second arm rigidly connectedwith the first mentioned arm and arranged to engage said lever to movesaid friction wheel into contact with said brake drum.

13. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a shaft rotatably mounted on saidframe, a driving member connected with said shaft, a sprocket wheelrotatably mounted on said shaft, a clutch for connecting said sprocketwheel with and disconnecting the same from said shaft, a boom pivotallymounted on said frame adjacent to said shaft, an auger supported at theouter end of said boom, a shaft mounted at the outer end of said boom, asprocket wheel mounted on said shaft, a chain connecting the twosprocket wheels one with the other, a driving connection between thelast mentioned sprocket wheel and said auger, a hoisting drum mounted onsaid frame, a cable connecting said hoisting drum with the outer end ofsaid boom, a second shaft mounted on said frame, a driving connectionbetween the two shafts on said frame, and manually controlled means forestablishing an operative connection between said second shaft and saidhoisting drum.

14. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, bearing brackets rigidly securedto and extending forwardly from said frame, a shaft journaled in saidbearing brackets, a driving member carried by said shaft, a sprocketwheel mounted on said shaft, a clutch for con necting said sprocketwheel with said shaft, a boom pivotally mounted on said bearing bracketsadjacent to said shaft, an auger supported by the outer end of saidboom, a sprocket wheel rotatably mounted on the outer end of said boom,a driving connection between the last mentioned sprocket wheel and theauger, and a sprocket chain connecting said last mentioned sprocketwheel with the first mentioned sprocket wheel.

15. In a mechanism of the character described, a frame having means forrigidly mounting the same on a motor vehicle, a driving member carriedby said frame, a boom pivotally mounted on said frame, an augerpivot-ally supported at the outer end of said boom, an operativeconnection between said driving member and said auger, and means for socontrolling the movement of said auger about its axis as to hold thesame normally in an inclined position,

16. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a driving member carried by saidframe, a boom pivotally mounted on said frame, an auger pivotallysupported from the outer end of said boom, an operative connectionbetween said driving member and said auger, and yieldable means forcontrolling the position of said auger with relation to said boom.

17. In a mechanism of the character described, a frame having means formounting the same on a motor vehicle, a driving member carried by saidframe, a boom pivotally mounted on said frame, an anger pivotallysupported from the outer end of said boom, an operative connectionbetween said driving member and said auger, a rod having one endpivotally connected with said auger and having its other end slidablymounted in a fixed part of said boom, a spring acting on said rod tomove the point of said auger away from said boom.

In testimony whereof, I afix my signature hereto.

OTTO COIL.

